x = 34

x = 340

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x = 34

x = 340

x - 34 = 0 : 15 = 0

x = 34 +0 

x = 34

b) x - 16 = 18 : 18

    x - 16 = 1

          x = 1 + 16 = 17

\(15-2.x=25\)

        \(2.x=15-25=-10\)

           \(x=\left(-10\right)\div2=-5\)

\(31-\left(17+x\right)=18\)

        \(\left(17+x\right)=31-18=13\)

                  \(x\)  \(=13-17=-4\)

15−2.x=2515−2.x=25

        2.x=15−25=−102.x=15−25=−10

           x=(−10)÷2=−5x=(−10)÷2=−5

31−(17+x)=1831−(17+x)=18

        (17+x)=31−18=13(17+x)=31−18=13

                  xx  =13−17=−4

\(a)x\times\dfrac{4}{7}=8\)                        \(b)\dfrac{1}{6}:x=\dfrac{5}{18}\)

\(x=8:\dfrac{4}{7}\)                                \(x=\dfrac{1}{6}:\dfrac{5}{18}\)

\(x=\dfrac{56}{4}=14\)                            \(x=\dfrac{18}{30}=\dfrac{3}{5}\)

a) x = 8 : 4/7

x = 14

b) x = 1/6 : 5/18

x = 3/5

3/5

1:

a: \(=\dfrac{-4}{7}+\dfrac{4}{7}+\dfrac{3}{7}-\dfrac{23}{34}-\dfrac{4}{5}=\dfrac{3}{7}-\dfrac{23}{34}-\dfrac{4}{5}=-\dfrac{1247}{1190}\)

b:

Sửa đề: \(\dfrac{-5}{13}+\dfrac{4}{19}+\dfrac{-8}{13}+\dfrac{15}{19}+\dfrac{45}{6}\) 

\(=\dfrac{-5}{13}-\dfrac{8}{13}+\dfrac{4}{19}+\dfrac{15}{19}+\dfrac{45}{6}=\dfrac{9}{2}\)

b: =15/31(34/63-11/21)=15/31x1/63=5/651

a: \(=\dfrac{67}{63}\cdot5+\dfrac{11}{31}\cdot\dfrac{5}{7}=5\left(\dfrac{67}{63}+\dfrac{11}{31\cdot7}\right)=\dfrac{10880}{1953}\)

a)67/63 x 15/3 + 15/31 x 11/21

Thiếu đề

b)15/31 x 34/63 - 11/21 x 15/31

=15/31 x ( 34/63 -11/21)

= 15/31 x  1/63=  5/651

b: =15/31(34/63-11/21)=15/31x1/63=5/651

a: \(=\dfrac{67}{63}\cdot5+\dfrac{11}{31}\cdot\dfrac{5}{7}=5\left(\dfrac{67}{63}+\dfrac{11}{31\cdot7}\right)=\dfrac{10880}{1953}\)

b: =15/31(34/63-11/21)=15/31x1/63=5/651

a: 

a) \(4x+4=16\)

\(4x=12\)

\(x=3\)

b) \(34\left(2x-6\right)=0\)

\(2x=6\)

\(x=3\)

c) \(15:x=5\)

\(x=15:5=3\)

d) \(20-\left(x+14\right)=5\)

\(x+14=20-5=15\)

\(x=15-14=1\)

a) \(4x+4=16\)

\(\Rightarrow4x=16-4\)

\(\Rightarrow4x=12\)

\(\Rightarrow x=\dfrac{12}{4}\)

\(\Rightarrow x=3\)

b) \(34\cdot\left(2x-6\right)=0\)

\(\Rightarrow2x-6=\dfrac{0}{36}\)

\(\Rightarrow2x-6=0\)

\(\Rightarrow2x=6\)

\(\Rightarrow x=\dfrac{6}{2}\)

\(\Rightarrow x=3\)

c) \(15:x=5\)

\(\Rightarrow x=15:5\)

\(\Rightarrow x=3\)

d) \(20-\left(x+14\right)=5\)

\(\Rightarrow x+14=20-5\)

\(\Rightarrow x+14=15\)

\(\Rightarrow x=15-14\)

\(\Rightarrow x=1\)

a) ( x - 34 ) . 15 = 0

=> x - 34 = 0

=> x = 34

b) 18.(x-16) = 18

=> x - 16 = 1

=> x = 1 + 16

=> x = 17

a) ( x - 34 ) . 15 = 0 

=> x - 34 = 0 : 15

=> x - 34 = 0

=> x = 34 

b) 18.(x-16) = 18 

=> x - 16 = 18 : 18

=> x - 16 = 1

=> x = 1 + 16

=> x = 17

a) ( x - 34 ) . 15 = 0

      x - 34         =  0 : 15

      x - 34         =  0

      x                = 0 + 34

      x                = 34

b) 18 . ( x - 16 ) = 18

            x - 16    = 18 : 18

            x - 16    = 1

            x           = 1 + 16

            x           = 17